The editor looks at a new silencer from John Rothery
One of the many attractions of airguns is that they’re nice and quiet, and in the form of a modern pre- charged pneumatic ( PCP) they really are nearly silent. To make the most of this fine quality, adding a silencer, or sound moderator as they really should be called, is a great idea. The noise that a silencer deals with is caused by the sudden release of high pressure air that follows the pellet as it exits the muzzle of our rifles. All that potential energy is suddenly free to expand violently because it’s no longer required to drive our pellet forward, and from a PCP it can make quite an angry crack. This is sure to annoy neighbours and could also alert unseen prey to the location of the airgun hunter. I’ve missed quarry in the past with a silenced gun to be allowed a second, this time successful shot, because the animal I was targeting didn’t know it had just been shot at.
What the moderator does is give the high pressure air a place to expand and slow down before exiting the far end. This dissipates the noise over a longer period than a bare barrel and the better designs work incredibly well, making the rifle whisper quiet.
John Rothery Wholesale has recently began to offer a new moderator from Mehr Sport – the Airstream HiPower – which looks like a good choice. At just under 6 ½“long it fits the standard dimensions that we’re used to and doesn’t add too much length to your rifle. Weight is 4.76oz so it’s not too heavy, either. The main body tube appears to be turned from an engineering plastic, perhaps Delrin and displays a subtle pattern along it’s length. The end caps appear to be aluminium and as I could see no opportunity to dismantle it, I have no idea what’s inside. The thread is female ½” UNF which is by far the most popular, so a great choice.
Looking down the muzzle end I could see a series of baffles as we’d expect ,but I was unable learn anything more than that. I think the choice of a synthetic material for the body is a good one because silencers are the first thing to get knocked in the field and the finish cannot get scratched off because it’s a solid material.
In a wholly unscientific test I unscrewed the Daystate silencer from my Big Test Huntsman Regal and shot with the AirStream for comparison, and I was unable to tell the difference. If this newcomer can match a top- end unit from one of the biggest brands, it must be doing a good job and is therefore well worth a look at your local gun shop.
ABOVE: An aluminium insert carries the female thread
LEFT: Engineering grade plastic forms the silencer’s body